US2002114029A1PendingUtilityA1
SRS pilot tone interaction and higher order effects in optical performance monitoring
Priority: Dec 18, 2000Filed: Dec 13, 2001Published: Aug 22, 2002
Est. expiryDec 18, 2020(expired)· nominal 20-yr term from priority
H04J 14/0298H04B 10/0775H04B 2210/075
37
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Claims
Abstract
The present invention relates to higher order effects in Stimulated Raman Scattering (SRS) error estimation in an optical fiber network, the network characterized in that it comprises the infrastructure required to measure the power levels of all optical channels using a pilot tone monitoring technique, the estimation comprising the steps of determining the multi-channel SRS error value by applying small signal analysis to the solution of the SRS system of differential equations, calculating the SRS error in a single fiber span for all channels by creating a Dither Transfer Matrix (DTM) and estimating SRS by observing higher order effects within the DTM.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A method for Stimulated Raman Scattering (SKS) error estimation incorporating higher order effects in an optical fiber network, the network characterized in that it comprises the infrastructure required to measure the power levels of all optical channels using a pilot tone monitoring technique, the estimation method comprising the steps of
(i) determining the multi-channel SRS error value by applying small signal analysis to the solution of the SRS system of differential equations as given below: p n ( z ) z + α · p n ( z ) + ( g ′ Δ f 2 A ) p n ( z ) ∑ m = 1 N ( m - n ) p m ( z ) = 0 where p n (z) is the power of the nth channel as a function of propagation distanced, t is the fiber attenuation coefficient, g′=dg/df represents the slope of the Raman gain profile, Δf is the inter-channel frequency spacing and A is the effective cross-sectional area of the (single-mode) fiber; and (ii) calculating the SRS error in a single fiber span for all channels by creating a Dither Transfer Matrix (DTM) to estimate SRS error by using the DTM to incorporate higher order effects, the equation substantially equal to: [ Δ p 1 Δ p 2 ⋮ Δ p N ] = [ f 11 f 12 ⋯ f 1 N f 21 f 22 ⋯ f 2 N ⋮ ⋮ ⋮ ⋮ f N 1 f N 2 ⋯ f NN ] [ a 1 a 2 ⋮ a 3 ] each f ki reflecting the amount of energy transfer from the dither of channel i to channel k. a i denotes the dither power in channel i.
2 . The estimation method according to claim 1 , further comprised of extending to estimate the SRS error with both a conventional (C) band detector and an extended (L) band detector of a C&L band system whereby the combined data of the two detectors is inputted into the DTM to estimate the SRS error.
3 . A system for Stimulated Raman Scattering (SRS) error estimation incorporating higher order effects in an optical fiber network, the network characterized in that it comprises the infrastructure required to measure the power levels of all optical channels using a pilot tone monitoring technique, the system comprising:
means for determining the multi-channel SRS error value by applying small signal analysis to the solution of the SRS system of differential equations as given below: p n ( z ) z + α · p n ( z ) + ( g ′ Δ f 2 A ) p n ( z ) ∑ m = 1 N ( m - n ) p m ( z ) = 0 where p n (z) is the power of the nth channel as a function of propagation distanced, a is the fiber attenuation coefficient, g′=dg/df represents the slope of the Raman gain profile, Δf is the inter-channel frequency spacing and A is the effective cross-sectional area of the (single-mode) fiber; and means for calculating the SRS error in a single fiber span for all channels by creating a Dither Transfer Matrix (DTM) to estimate SRS error by using the DTM to incorporate higher order effects, the equation substantially equal to: [ Δ p 1 Δ p 2 ⋮ Δ p N ] = [ f 11 f 12 ⋯ f 1 N f 21 f 22 ⋯ f 2 N ⋮ ⋮ ⋮ ⋮ f N 1 f N 2 ⋯ f NN ] [ a 1 a 2 ⋮ a 3 ] each f ki reflecting the amount of energy transfer from the dither of channel i to channel k. a i denotes the dither power in channel i.
4 . The system according to claim 3 , further comprised of a means for extending to estimate the SRS error with both a conventional (C) band detector and an extended (L) band detector of a C&L band system whereby the combined data of the two detectors is inputted into the DTM to estimate the SRS error.
5 . A system for Stimulated Raman Scattering (SRS) error estimation incorporating higher order effects in an optical fiber network, the network characterized in that it comprises the infrastructure required to measure the power levels of all optical channels using a pilot tone monitoring technique, the system comprising:
a first network component having embedded computer readable code comprising an equation substantially equal to: p n ( z ) z + α · p n ( z ) + ( g ′ Δ f 2 A ) p n ( z ) ∑ m = 1 N ( m - n ) p m ( z ) = 0 where p n (z) is the power of the nth channel as a function of propagation distanced, a is the fiber attenuation coefficient, g′=dg/df represents the slope of the Raman gain profile, Δf is the inter-channel frequency spacing and A is the effective cross-sectional area of the (single-mode) fiber whereby a multi-channel SRS error value is determined by applying small signal analysis to the solution of the SRS system of differential equations as given above; a second network component having embedded computer readable code comprising a Dither Transfer Matrix (DTM) substantially equal to [ Δ p 1 Δ p 2 ⋮ Δ p N ] = [ f 11 f 12 ⋯ f 1 N f 21 f 22 ⋯ f 2 N ⋮ ⋮ ⋮ ⋮ f N 1 f N 2 ⋯ f NN ] [ a 1 a 2 ⋮ a 3 ] each f ki reflecting the amount of energy transfer from the dither of channel I to channel k. a i denotes the dither power in channel i, to calculate the SRS error in a single fiber span for all channels; and a third network component having embedded computer readable code for estimating SRS by observing higher order effects within the DTM.
6 . The system according to claim 5 , further comprising a fourth network component having embedded computer readable code for extending to estimate the SRS error with both a conventional (C) band detector and an extended (L) band detector of a C&L band system whereby the combined data of the two detectors is inputted into the DTM to estimate the SRS error.
7 . A system for Stimulated Raman Scattering (SRS) error estimation incorporating higher order effects in an optical fiber network, the network characterized in that it comprises the infrastructure required to measure the power levels of all optical channels using a pilot tone monitoring technique, the system comprising:
a network component having embedded computer readable code comprising an equation substantially equal to: p n ( z ) z + α · p n ( z ) + ( g ′ Δ f 2 A ) p n ( z ) ∑ m = 1 N ( m - n ) p m ( z ) = 0 where p n (z) is the power of the nth channel as a function of propagation distanced, a is the fiber attenuation coefficient, g′=dg/df represents the slope of the Raman gain profile, Δf is the inter-channel frequency spacing and A is the effective cross-sectional area of the (single-mode) fiber whereby a multi-channel SRS error value is determined by applying small signal analysis to the solution of the SRS system of differential equations as given above; the network component having embedded computer readable code comprising a Dither Transfer Matrix (DTM) equation substantially equal to [ Δ p 1 Δ p 2 ⋮ Δ p N ] = [ f 11 f 12 ⋯ f 1 N f 21 f 22 ⋯ f 2 N ⋮ ⋮ ⋮ ⋮ f N 1 f N 2 ⋯ f NN ] [ a 1 a 2 ⋮ a 3 ] each f ki reflecting the amount of energy transfer from the dither of channel i to channel k. a i denotes the dither power in channel i, to calculate the SRS error in a single fiber span for all channels; and the network component having embedded computer readable code for estimating SRS by observing higher order effects within the DTM.
8 . The system according to claim 7 , further comprising the network component having embedded computer readable code for extending to estimate the SRS error with both a conventional (C) band detector and an extended (L) band detector of a C&L band system whereby the combined data of the two detectors is inputted into the DTM to estimate the SRS error.Join the waitlist — get patent alerts
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